EP 0833148 B1 20041103 - A method and a device for controlling an air /fuel ratio sensor
Title (en)
A method and a device for controlling an air /fuel ratio sensor
Title (de)
Verfahren und Vorrichtung zur Kontrolle eines Luft-Kraftstoff Verhältnissensors
Title (fr)
Méthode et dispositif de contrôle pour un capteur de rapport air-carburant
Publication
Application
Priority
JP 28033196 A 19960930
Abstract (en)
[origin: EP0833148A2] An air/fuel ratio sensor is controlled such that the oxygen concentration of the measurement gas can be detected from a pump current substantially instantaneously after a heater turns on. In the air/fuel ratio sensor an oxygen pumping cell and an oxygen concentration measuring cell are each formed of a solid electrolytic layer interposed between a pair of porous electrodes. One of the electrodes of each cell defines a measurement gas chamber in which the diffusion of the measurement gas is controlled. After a micro current is supplied to the other electrode of the oxygen concentration measuring cell for a predetermined period of time, thereby forming an internal reference oxygen source, the supply of the micro current is stopped and at the same time a pump current in the oxygen pumping cell starts to be controlled until the interelectrode voltage of the oxygen concentration measuring cell reaches a target voltage. After the air/fuel ratio sensor is activated, the supply of the micro current is restarted. <IMAGE>
IPC 1-7
IPC 8 full level
G01N 27/41 (2006.01); G01N 27/406 (2006.01); G01N 27/419 (2006.01)
CPC (source: EP US)
G01N 27/4065 (2013.01 - EP US); G01N 27/419 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB IT
DOCDB simple family (publication)
EP 0833148 A2 19980401; EP 0833148 A3 19981007; EP 0833148 B1 20041103; DE 69731445 D1 20041209; DE 69731445 T2 20051110; JP 3520163 B2 20040419; JP H10104195 A 19980424; US 5895564 A 19990420
DOCDB simple family (application)
EP 97116325 A 19970919; DE 69731445 T 19970919; JP 28033196 A 19960930; US 92752797 A 19970911